*{
    padding: 0;
    margin: 0;
  }
  div{
    float: left;
  }
  body{
    background-color: rgb(39, 37, 37);
  }
  img{
    display: block;
  }
  .small-img{
    position: relative;
  }
  .small-img img{
    width: 500px;
    height: 500px;
  }
  .big-img{
    width: 500px;
    height: 500px;
    position: relative;
    overflow: hidden;
    border: 1px solid red
  }
  .big-img img{
    position: absolute;
    width: 1000px;
    height: 1000px;
  }
  .move-bar{
    width: 150px;
    height: 150px;
    position: absolute;
    top:0;
    left: 0;
    background-color: rgba(255,255,255,0.3);
  }